Its the Hyperspace and no Nebula you see through the Window.
This is Casperheads Modelwith his Daedalus in one, but massive improved with Cinema 4D, heres a look how it looks as i had it become from him:
At the Meshes-Section at Sci-Fi Meshes you can Download a very good Model of the Prometheus-Bridge, in the moment i have no Plans to Release it, maybe adter i have Made some Pictures with it.